/**
 * Reads the `type` field off an inbound bridge message, if any.
 *
 * Used by both sides of the bridge after the canonical message schema rejects a payload. We still
 * want to know what type the sender claimed to be sending so we can (a) avoid NACK loops on
 * `invalidHostMessage` / `invalidSandboxMessage` and (b) include the type in the failure reason
 * for debugging.
 */
export function readIncomingType(data: unknown): string | undefined {
	if (
		typeof data === "object" &&
		data !== null &&
		"type" in data &&
		typeof data.type === "string"
	) {
		return data.type
	}
	return undefined
}